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AP EAMCET202018 Sep 2020Morning ShiftPhysicsCommunication SystemActual

An AM wave has (1800 ~W ) of total power content for (100 % ) modulation the carrier should have power content equal to

Options

  1. A(1000 ~W )
  2. B(1200 ~W )
  3. C(1500 ~W )
  4. D(1600 ~W )

Correct answer

B. (1200 ~W )

Step-by-step solution

Total power of AM wave, (P_t=1800 ~W ) For (100 % ) modulation, depth of modulation, (m=1 ) If (P_c ) be the carrier power, then we know that, ( aligned & & P_t=P_c (1+ m^2 2 ) & P_t & =P_c (1+ 1 2 ) P_t= 3 2 P_c & P_c & = 2 3 P_t = 2 3 1800=1200 ~W aligned )

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